125 lines
4.2 KiB
Nix
125 lines
4.2 KiB
Nix
{ lib, stdenv, buildEnv
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, haskell, nodejs
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, fetchurl, fetchpatch, makeWrapper, git }:
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# To update:
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# 1) Modify ./update.sh and run it
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# 2) to generate versions.dat:
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# 2.1) git clone https://github.com/elm/compiler.git
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# 2.2) cd compiler
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# 2.3) cabal2nix --shell . | sed 's/"default",/"ghc822",/' > shell.nix
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# 2.4) nix-shell
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# 2.5) mkdir .elm
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# 2.6) export ELM_HOME=$(pwd)/.elm
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# 2.7) cabal build
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# 2.8) cp .elm/0.19.0/package/versions.dat ...
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# 3) generate a template for elm-elm.nix with:
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# (
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# echo "{";
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# jq '.dependencies | .direct, .indirect | to_entries | .[] | { (.key) : { version : .value, sha256: "" } } ' \
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# < ui/browser/elm.json \
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# | sed 's/:/ =/' \
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# | sed 's/^[{}]//' \
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# | sed -E 's/(["}]),?$/\1;/' \
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# | sed -E 's/"(version|sha256)"/\1/' \
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# | grep -v '^$';
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# echo "}"
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# )
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#
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# ... then fill in the sha256s
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# Notes:
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# the elm binary embeds a piece of pre-compiled elm code, used by 'elm
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# reactor'. this means that the build process for 'elm' effectively
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# executes 'elm make'. that in turn expects to retrieve the elm
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# dependencies of that code (elm/core, etc.) from
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# package.elm-lang.org, as well as a cached bit of metadata
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# (versions.dat).
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# the makeDotElm function lets us retrieve these dependencies in the
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# standard nix way. we have to copy them in (rather than symlink) and
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# make them writable because the elm compiler writes other .dat files
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# alongside the source code. versions.dat was produced during an
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# impure build of this same code; the build complains that it can't
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# update this cache, but continues past that warning.
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# finally, we set ELM_HOME to point to these pre-fetched artifacts so
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# that the default of ~/.elm isn't used.
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let
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makeDotElm = ver: deps:
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let versionsDat = ./versions.dat;
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cmds = lib.mapAttrsToList (name: info: let
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pkg = stdenv.mkDerivation {
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name = lib.replaceChars ["/"] ["-"] name + "-${info.version}";
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src = fetchurl {
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url = "https://github.com/${name}/archive/${info.version}.tar.gz";
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meta.homepage = "https://github.com/${name}/";
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inherit (info) sha256;
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};
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phases = [ "unpackPhase" "installPhase" ];
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installPhase = ''
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mkdir -p $out
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cp -r * $out
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'';
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};
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in ''
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mkdir -p .elm/${ver}/package/${name}
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cp -R ${pkg} .elm/${ver}/package/${name}/${info.version}
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'') deps;
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in (lib.concatStrings cmds) + ''
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mkdir -p .elm/${ver}/package;
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cp ${versionsDat} .elm/${ver}/package/versions.dat;
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chmod -R +w .elm
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'';
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hsPkgs = haskell.packages.ghc822.override {
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overrides = self: super: with haskell.lib;
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let elmPkgs = {
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elm = overrideCabal (self.callPackage ./packages/elm.nix { }) (drv: {
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# sadly with parallelism most of the time breaks compilation
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enableParallelBuilding = false;
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preConfigure = ''
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export ELM_HOME=`pwd`/.elm
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'' + (makeDotElm "0.19.0" (import ./packages/elm-elm.nix));
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buildTools = drv.buildTools or [] ++ [ makeWrapper ];
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patches = [
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(fetchpatch {
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url = "https://github.com/elm/compiler/pull/1784/commits/78d2d8eab310552b1b877a3e90e1e57e7a09ddec.patch";
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sha256 = "0vdhk16xqm2hxw12s1b91a0bmi8w4wsxc086qlzglgnjxrl5b3w4";
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})
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];
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postInstall = ''
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wrapProgram $out/bin/elm \
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--prefix PATH ':' ${lib.makeBinPath [ nodejs ]}
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'';
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});
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/*
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The elm-format expression is updated via a script in the https://github.com/avh4/elm-format repo:
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`pacakge/nix/build.sh`
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*/
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elm-format = self.callPackage ./packages/elm-format.nix {};
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};
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in elmPkgs // {
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inherit elmPkgs;
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elmVersion = elmPkgs.elm.version;
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# Needed for elm-format
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indents = self.callPackage ./packages/indents.nix {};
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tasty-quickcheck = self.callPackage ./packages/tasty-quickcheck.nix {};
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};
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};
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in hsPkgs.elmPkgs
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